I will ask the organizers tomorrow.  However, I suspect from other things that the plenary and invited lectures will be given lower priority than the current output, as much is being done to popularize mathematics for Brazil.  My guess is that Mark Sapir is right, and that you will have to wait a few days for the lectures meant for specialists (non-public). As a second guess, I imagine they are preparing Portuguese translations, and that doing so within ten days will be an impressive feat.

Gerhard "Impressive To Me, At Least" Paseman, 2018.08.03.